Undecidability of the unification and admissibility problems for modal and description logics
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\begin{bibtex} @article{DBLP:journals/tocl/WolterZ08,
author = {Frank Wolter and
Michael Zakharyaschev},
title = {Undecidability of the unification and admissibility problems
for modal and description logics},
journal = {ACM Trans. Comput. Log.},
volume = {9},
number = {4},
year = {2008},
ee = {http://doi.acm.org/10.1145/1380572.1380574},
bibsource = {DBLP, http://dblp.uni-trier.de}
}
\end{bibtex}
